Means for loosening the tube from the mandrel in the manufacture of tubes.



K. B. WESTIN.

MEANS FOR LOOSENING'THE TUBE FROM THE MANDREL IN THE MANUFACTURE OFTUBES.

APPLIOATION FILED NOV. 16, 1912.

1,068,549, fitented July 29, 1913.

2 SHEETS-SHEET l. 17 a 2* 4 INVENTOR. KARL ROBERTWEfiTIN NQWQOM 4.

ATTORNEY K. R. WESTIN.

MEANS r012 Loosnmm THE TUBE mom THE MANDREL IN THE MANUFACTURE OF TUBES.

APPLICATION TILED NOV. 16. 1912. 1 549 Patented July 29, 1913.

- 2 SHEETS-SHEET 2.

' WlTN 11655 INvENTO KARL ROBERT WESTIN ATTORNEY EN I UNlTED STATESPATENT OFFICE.

KARL ROBERT WESTIN, OF SANDVIKEN, SWEDEN.

MEANS FOR LOOSENING THE TUBE FROM THE MANDBEL IN THE MANUFACTURE OFTUBES.

Specification of Letters latent.

Patented July 29, 1913.

Application filed November 18, 1912. Serial No. 731,818.

; eningthe tube from the mandrel in the rollthe rotating casing.

ing or drawing of tubes, in which device are used rollers, in a rotatingdisk, casing or the like and journaled in an oblique direction relativeto the longitudinal axis-of the tube. This device, in combination withthemandrel, rolls the tube crosswise, thus enlarging the tube. Theoblique position of the rollers relative to the tube causes the rollersto have a tendency to move along spiral lines around the tube, so thatthey do not counteract the motion of the tube in its longitudinaldirection, even thou h there is often a stress, in axial direction,between the rollersand The object of this invention is to so arrange thesaid parts, that the effect of the said stress as an obstacle tothe'operation of the device, that is, to its rotation, is reduced to aminimum, the rollers at the same time being easily accessible foradjustin the ressure effected by the same. This oJject I is gained byhaving the rollers joiirnalcd not directly in the rotary disk or casingbut in special adjustable bearings provided in the same, and by havingthe hollow trunnions of the disk or casing not wider than is necessaryfor the passage of the tube, and by having annular shoulders or bearingsurfaces, on the said trunnions, which will sustain the axial pressure.Owing to this arrangement the device will run easily and the rollers caneasily be tightened, when desired, the means provided for effecting thetightening being easily accessible.

The accompanying drawings show a portion of a drawing machine, arrangedin accordance with this invention.

Figure 1 is a side view and Fig. 2 is. a plan view of the same. Figs. 3and 4 show, on a larger scale, the loosening device in an end View and aside view respectively both artly in section.

'- .The loosening device consists of the casing 1, comprising the disk 2and the side plates 3, 3, the latter being provided with the hollow,tube-like trunnions 4, 4, by means of which the casing is journaled inthe frame 5 of the machine, so the tube drawn forward by the hook G, canpass through the trunnions.

The disk 2 has radial recesses 7, having therein suitable bearings 6, inwhich are journaled the rollers 9 adapted to bear against a tube passingthrough the device. These rollers, preferably three, are'located aroundthe tube, equidistant from each other. For tightening the rollers wedges10 are provided on the outer side of the respective bearing 8 andslidable in the recesses 7, the wedges each consisting of a sleeve orthe like in screw-threaded engagement with screws 11 or the likeextending through the casing l longitudinally of the same, whereby thesleeves may be moved by rotating the screws or moving the same in theirlongitudinal direction. In order that all the rollers maybe tighteneduniformly and .at the same time and that the tightening operation may beeffected during the operation ofthe machine, the screws may be providedwith pinions l2, en aging a common toothed wheel 13, located on one ofthe trunnions at, so that by rotating said toothed wheel with relationto the casing l, the pinions are caused to rotate. The pinions and thetoothed wheel are shown in Fig. l. The shafts of the rollers 9 haveoblique positions relative to the longitudinal axis of the tube 2'. a.the said shafts are not fully parallel to the said axis, so that thedirection of the rolling movement of the rollers corresponds to thespiral line described by the rollers moving around the tube. Owing tothis arrangement and by iii'ipai'ting to the casing a suitable rotaryvelocity, it is possible to pass the tube between the rollers. Thecasing may be arranged like a pulley and be rotated by means 0 a beltpassingaround the same, or the casing may be rotated by any othersuitable motion transmitting device. The annular shoulders P, providednear the ends of said trunnions 4, 4, or the end surfaces of the saidtrunnions bear themselves against corresponding surfaces, provided onthe bearings of the casing or any other suitable statioii ar part, sothat the casing is sustained axial y, near its center line. Thedescribed loosemng device is located between the draw plate or jaws andthe mechanism which draw the tube and the mandrel simultaneously throughthe device. By the action of the rollers the tube is enlarged andloosened from the ,mandrel. The described device may be used, also inthe manufacture of tubes by the aid of a mandrel not only in themanner-"described above, but also in any other suitable manner.

Having now described my invention, what I claim as'new and desire'tosecure by Let ters Patent is:

. 1. In a machine for operating upon tubes manufactured by the aid of amandrel, the combination of a rotary disk'having a central opening andradial recesses having closed outer ends; bearing blocks radiallyslidable in said recesses and each having an inclined outer face;rollers journaled in said blocks having their axes oblique to the axisof the disk; wedges in said recesses between the closed endsland saidinclined faces, and each provided with a longitudinally threaded bore;screws passing through a face of thevcarrier into said bores; pinions onthe ends of the screws; and a wheel having teeth engaging all of thepinions.

2. In a machine for operating upon tubes manufactured by the aid of amandrel, the combination of a rotary disk having radial recesses havingclosed outer ends; blocks in said recesses and having inclined outer endfaces; rollers mounted on said blocks; Wedges between said outer endsand said faces; and means for simultaneously positively moving saidwedges;

3. In a device for operating upon tubes manufactured by the aid of amandrel, the combination of a rotary carrier having an axial passageprovided in the same for the' passage of the tube and mandrel; rollerslo cated in the said carrier, which during the rotary motion of thecarrier are forced against the tube to enlarge the same; bearings f01'tll8 said rollers; wedges supporting the said bearings; screws for thetightening of the said wedges; pinions provided on the screws forrotating the same;'and a toothed driving wheel common tothe said pinionsfor tightening all the rollers against the tubes simultaneously.

4. In a machine for operating upon tubes manufactured by the aid of amandrel, the combination of a disk having an open central part andradial recesses communicating therewith; side plates secured on oppositefaces of said disk and havin oppositely disosed alined trunnions eachaving an annuar shoulder forming a reduced end; fixed alined bearingsupports receiving said ends and. engaging against said shouldersrespectively bearing blocks radially slidable in said recesses and eachhaving alined bearings at its inner part and an inclined outer face, theaxis of the alined bearings of each block being oblique to the axis ofthe trunnions; rollers journaled in the bearings of each block; wedgesin the radial recesses between said inclined outer face and the end faceof the recesses and each provided with a longitudinal threaded bore;screws passing through the side plates and engaging in said bores;pinions on the outer ends of the screws; and a toothed wheelrotatable.on one of said trunnions and engaging said pinions.-

In witness whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

KARL ROBERT WESTIN. Witnesses:

AxEL EHRNER, Gama. PRICE.

